Hanna Heller is a fifteen-year-old girl who lives with her father, Erik, in rural northern Finland. Since the age of two, Hanna has been trained by Erik, an ex-CIA operative from Germany, to be a skilled assassin. He teaches her hand-to-hand combat and drills her in target shooting. Erik knows a secret that cannot become public, and Marissa Wiegler, a senior CIA officer, searches for him in order to eliminate him. Erik has trained Hanna with the...